Large-view-field high-and-low-temperature compensation method for broadband large-zoom-ratio continuous zoom camera

Abstract

The invention relates to a large-view-field high-and-low-temperature compensation method for a broadband large-zoom-ratio continuous zoom camera. The method comprises the following steps: opening the design data of an optical system of the wide-band large-zoom-ratio continuous zoom camera in zemax software, and setting the linear thermal expansion coefficient of each structural member material; adjusting a temperature to a value out of the large-view-field design temperature interval of the optical system, adjusting the working distance of a focal plane until imaging is clear, and recording the working distance of the focal plane at the moment; and calculating a focal plane change value between the focal plane working distance at the moment and a focal plane working distance under the default temperature of the optical system, and selecting a material corresponding to the linear thermal expansion coefficient according to the focal plane change value to carry out thermal compensation on an image plane. According to the method, the focal plane working distance at high and low temperatures is simulated in the zemax software, the variable quantity of the focal plane is found, materials meeting the linear thermal expansion coefficients are found and are manufactured into corresponding parts, and thermal expansion of the parts is utilized for thermal compensation of the image plane, so the phenomenon of image blurring under the condition of a large view field is perfectly solved.

Description

technical field [0001] The invention belongs to the technical field of camera systems, and in particular relates to a high and low temperature compensation method for a wide-band large zoom ratio continuous zoom camera with a large field of view. Background technique [0002] Due to its long working distance, large zoom ratio, and wide spectrum, the camera system is widely used in airborne or vehicle-mounted search, aiming and indicating systems for visible and near-infrared imaging of targets under typical weather conditions. Observe and search for targets during the day. When the camera system operates in high and low temperature environments, such as extremely cold and tropical regions, the image will become blurred. In the case of small field of view, the blurring of the image can be compensated for the defocusing of the image plane caused by high and low temperature through the focusing function; while for a large field of view, the image plane is defocused due to high...

AI Technical Summary

Problems solved by technology

When the camera system operates in high and low temperature environments, such as operating in extremely cold and tropical regions, there is a phenomenon that the image becomes blurred

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